I might have mixed up some things, but...didn't we already knew that Canon would open…
A pro EOS R model with a hybrid EF/RF lens mount is rumored over the web.
It’s suggested the upcoming pro EOS R, i.e. a Canon EOS R body aimed a photography professionals and on the same tier as the EOS-1D X lineup, might be able to natively mount both RF and EF mount lenses.
Being able to mount both EF and RF mount lenses without using an adapter would be a killer feature. It’s not surprising it is rumored for the fabled EOS-1D X-like professional EOS R that might be announced next year, or in 2021 (all rumors).
As weird as this rumor may sound we give it some credit. While technically complex to implement it is surely not impossible, and we know Canon has the know how and the skills to do it. On other words: it’s feasible for Canon.
What do you think, is this rumor plausible? All Canon rumors are listed here.
Source: Canon Rumors